diff --git a/configure.zcml b/configure.zcml
index bb85de0..73fc9e3 100644
--- a/configure.zcml
+++ b/configure.zcml
@@ -258,6 +258,14 @@
              set_schema="loops.interfaces.IPredicate" />
   </class>
 
+  <adapter factory="loops.predicate.MappingAttributeRelation" trusted="True" />
+  <class class="loops.predicate.MappingAttributeRelation">
+    <require permission="zope.View"
+             interface="loops.interfaces.IMappingAttributeRelation" />
+    <require permission="zope.ManageContent"
+             set_schema="loops.interfaces.IMappingAttributeRelation" />
+  </class>
+
   <adapter factory="loops.query.QueryConcept" trusted="True" />
   <class class="loops.query.QueryConcept">
     <require permission="zope.View"
diff --git a/interfaces.py b/interfaces.py
index 8fdf8dd..7c834f2 100644
--- a/interfaces.py
+++ b/interfaces.py
@@ -624,7 +624,7 @@ class ITypeConcept(IConceptSchema):
         required=False)
 
     viewName = schema.TextLine(
-        title=_(u'View name'),
+        title=_(u'View Name'),
         description=_(u'Name of a special view be used for presenting '
                        'objects of this type.'),
         default=u'',
@@ -640,6 +640,8 @@ class ITypeConcept(IConceptSchema):
     # storage = schema.Choice()
 
 
+# predicates
+
 class IPredicate(IConceptSchema):
     """ Provided by predicates (predicate concepts that specify relation types),
         i.e. concepts of type 'predicate' should be adaptable to this interface.
@@ -655,6 +657,31 @@ class IPredicate(IConceptSchema):
         required=False)
 
 
+class IMappingAttributeRelation(IConceptSchema):
+    """ A relation based on a predicate ('mappingAttribute') that provides
+        values for an attribute name on a parent and a corresponding
+        identifiers on the the child objects that will be used as keys
+        on the parent's mapping attribute.
+
+        These values should be indexed by the relation registry to provide
+        direct access.
+    """
+
+    attrName = schema.TextLine(
+        title=_(u'Attribute Name'),
+        description=_(u'Name of the mapping attribute this predicate '
+                    'represents on the parent concept.'),
+        required=True)
+
+    attrIdentifier = schema.TextLine(
+        title=_(u'Child Identifier'),
+        description=_(u'Identifier of the child that may be used as a '
+                    'key on the parent\'s mapping attribute.'),
+        required=True)
+
+
+# resources
+
 class IResourceAdapter(IBaseResourceSchema):
     """ Base interface for adapters for resources. This is the base interface
         of the interfaces to be used as typeInterface attribute on type concepts
diff --git a/predicate.py b/predicate.py
index 3bdb722..a5189aa 100644
--- a/predicate.py
+++ b/predicate.py
@@ -17,7 +17,7 @@
 #
 
 """
-Predicate management.
+Definition and management of special predicates and corresponding relations.
 
 $Id$
 """
@@ -31,7 +31,7 @@ from zope.security.proxy import removeSecurityProxy
 from zope.traversing.api import getName
 
 from loops.interfaces import ILoopsObject, IConcept, IResource
-from loops.interfaces import IPredicate
+from loops.interfaces import IPredicate, IMappingAttributeRelation
 from loops.concept import Concept
 from loops.common import AdapterBase
 from loops.type import TypeInterfaceSourceList
@@ -46,7 +46,7 @@ class Predicate(AdapterBase):
 
     implements(IPredicate)
 
-    _contextAttributes = list(IPredicate) + list(IConcept)
+    _contextAttributes = list(IPredicate) # + list(IConcept)
 
 
 class PredicateInterfaceSourceList(TypeInterfaceSourceList):
@@ -56,3 +56,14 @@ class PredicateInterfaceSourceList(TypeInterfaceSourceList):
 
     typeInterfaces = ()
 
+
+# standard relation adapters
+
+PredicateInterfaceSourceList.typeInterfaces += (IMappingAttributeRelation,)
+
+
+class MappingAttributeRelation(AdapterBase):
+
+    implements(IMappingAttributeRelation)
+
+    _contextAttributes = list(IMappingAttributeRelation)
diff --git a/tests/setup.py b/tests/setup.py
index 82e1715..765b522 100644
--- a/tests/setup.py
+++ b/tests/setup.py
@@ -35,7 +35,7 @@ from cybertools.composer.schema.field import DateFieldInstance, BooleanFieldInst
 from cybertools.composer.schema.field import EmailFieldInstance, ListFieldInstance
 from cybertools.composer.schema.instance import Instance, Editor
 from cybertools.relation.tests import IntIdsStub
-from cybertools.relation.registry import RelationRegistry
+from cybertools.relation.registry import RelationRegistry, IIndexableRelation
 from cybertools.relation.interfaces import IRelation, IRelationRegistry
 from cybertools.relation.interfaces import IRelationInvalidatedEvent
 from cybertools.relation.registry import IndexableRelationAdapter
@@ -54,7 +54,7 @@ from loops.interfaces import ILoopsObject, IIndexAttributes
 from loops.interfaces import IDocument, IFile, ITextDocument
 from loops.organize.memberinfo import MemberInfoProvider
 from loops.organize.stateful.base import StatefulResourceIndexInfo, handleTransition
-from loops.predicate import Predicate
+from loops.predicate import Predicate, MappingAttributeRelation
 from loops.query import QueryConcept
 from loops.query import QueryConcept
 from loops.resource import Resource, FileAdapter, TextDocumentAdapter
@@ -95,6 +95,9 @@ class TestSite(object):
         component.provideUtility(IntIdsStub())
         relations = RelationRegistry()
         relations.setupIndexes()
+        for idx in ('_attrName', '_attrIdentifier'):
+            if idx not in relations:
+                relations[idx] = FieldIndex(idx, IIndexableRelation)
         component.provideUtility(relations, IRelationRegistry)
 
         component.provideUtility(PrincipalAnnotationUtility(), IPrincipalAnnotationUtility)
@@ -112,6 +115,7 @@ class TestSite(object):
         component.provideAdapter(LoopsType)
         component.provideAdapter(ConceptType)
         component.provideAdapter(Predicate)
+        component.provideAdapter(MappingAttributeRelation)
         component.provideAdapter(ResourceType, (IDocument,))
         component.provideAdapter(TypeConcept)
         component.provideAdapter(QueryConcept)